DMS-EB2 [MURATA]
Multi-Purpose Application Board for DMS-20PC/LCD Meters; 多功能应用板的DMS- 20PC / LCD仪表
| 型号： | DMS-EB2 |
| 厂家： | 
muRata |
| 描述： | Multi-Purpose Application Board for DMS-20PC/LCD Meters |
| 文件： | 总4页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DMS-EB2
Multi-Purpose Application Board
for DMS-20PC/LCD Meters
The DMS-EB2 Application Board was designed for quick and easy application/evalu-
ation of DATEL's subminiature DMS-20PC/LCD Series, 3½ Digit, LED/LCD Display, Digital
Panel Voltmeters. The DMS-EB2's versatility, low cost and direct DMS-20PC/LCD plug-in
compatibility makes interfacing a breeze. The DMS-EB2 covers many common panel-
meter applications while providing easy signal and power I/O terminations (via a standard
MOLEX connector) and plug-in versatility when changing from one application to another.
The DMS-EB2 has provisions for such common applications as input dividers for high
input voltages, gain (span) adjustment, 9/12Vdc battery operation, and decimal point place-
ment. The board permits direct signal I/O wiring via the interface connector or soldering
directly to the board. The DMS-EB2 is fully compatible with all four versions of the DMS-
20PC/LCD ( 200mV, 2V, 20V, 200V) making it interchangeable from meter to meter
and application to application. Solder gaps
FEATURES
N
Gain (span) adjustment
N
Input divider network for attenuating voltages
up to 250Vdc
N
Operate meter and board from +5V supply or
9/12V battery
N
On-board solder gaps for decimal point placement
N
On-board I/O connector for easy power and signal input
12
1
R1
SG10
are conveniently placed on the board and
may be quickly bridged or cut as required.
This low-cost addition to DATEL's
R2
SG14 SG6 SG5 SG4
expanding line of subminiature meters dem-
onstrates our continuing commitment to offer
the most versatile, easy-to-use panel-meter
products.
R5
J1
C1
2
+C2
U1
SG15
1
3
4
5
6
J2
SG1
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢁ
For full details go to
www.murata-ps.com/rohs
Figure 1. DMS-EB2 Schematic Diagram
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-EB2.E01 Page 1 of 4
DMS-EB2
Multi-Purpose Application Board
for DMS-20PC/LCD Meters
A 10μF/35V tantalum capacitor (C2 on schematic) should be installed
with the polarized end next to the + symbol on the DMS-EB2. This is
especially important if the power source is located far from U1.
Functional Specifications (TA = 25ºC)
Input Supply Range
See applicable meter's data sheet
5. Soldering: DATEL recommends the use of "no-clean" solders when
Input Supply Range U1 (LM7805CT) Installed:
making modifications to the DMS-EB2.
DMS-20PC-X-XS
DMS-20PC-X-XL
DMS-20LCD-X-5
DMS-20LCD-X-5B
+7.5 to +12.6V
+7.5 to +32.0V
+7.5 to +32.0V
+7.5 to +12.6V
APPLICATIONS
Operating and Storage Temperature
See applicable meter's data sheet
As shipped, the DMS-EB2 is configured for single-ended operation.
This configuration is preferred for simple voltage measurements and will
generally cover most standard applications. Figure 1 indicates which
solder gaps are shipped closed from the factory.
Humidity
0 to 95%, non-condensing
Dimensions
1.25" (31.8mm)L x 0.75" (19.1mm)H
Simply solder the board onto the meter (pin 1 to pin 1), connect
the power supply to J1, pin 5 (+V) and the power return to J1, pin 6
(GROUND).
J1 Connector & Wire Information
Terminal Type
Crimp Tool
Wire Size
DATEL P/N 39-2099090
DATEL P/N 39-2099000
22 to 26 AWG
Insulation Diameter
Stripping Length
0.062" (1.57mm) max.
0.100" to 0.125"
(2.54 to 3.17mm)
Pin Function
1
2
3
4
5
6
(+) INPUT HI
J1
(–) INPUT LO
1
2
3
4
5
6
TEST/HOLD IN
Ordering Information
TEST/HOLD OUT
DMS-EB2
DMS-BZL3
DMS-BZL4
Application board with mating connector and terminals
DMS-20 bezel assembly
DMS-20 bezel assembly with sealing gasket
+V (Positive power connection)
–V (Ground, negative power return)
Figure 2. J1 Connector Pinout
39-0304000 LM7805CT (U1), +5V-output, three-terminal regulator
39-2359625 6-position pc-board socket
1.Decimal Point Placement: DATEL ships the DMS-EB2 with all decimal
point solder gaps (SG1, SG2 and SG3) open. To enable a specific
decimal point, close its respective solder gap with solder. When
re-assigning decimal places for subsequent applications, remember to
unsolder previously closed solder gaps.
TECHNICAL NOTES
1.LCD Backlighting: To backlight a DMS-20LCD meter, connect J1, pin 3
(TEST/HOLD IN) to J1, pin 6 (GND). This allows for external control,
via a switch, of the backlight feature. The switch should be rated for low
voltage operation at 35mA.
Close SG1 for 1.999 (DP1)
Close SG2 for 19.99 (DP2)
Close SG3 for 199.9 (DP3)
2. Display Test (Not Available on LCD Models): Tie pin 4 (TEST/HOLD
OUT) to pin 3 (TEST/HOLD IN) to test the display of the DMS-20PC.
Do not leave the meter in the test mode for more than 10 seconds. On
LED meters with the HOLD option, tying pins 3 and 4 together freezes
the display reading.
2.9V LCD Meters: DMS-20LCD-X-9 meters cannot be used in a single-
ended configuration, i.e., with (–) IN LO tied to GND. On these models,
both (–) IN LO and (+) IN HI have to be a minimum of 1.5V above and
1.5V below J1 pins 6 and 5, respectively. To operate from a 9V or 12V
battery with (–) IN LO tied to GND, use a 5V-powered meter (DMS-
20LCD-X-5), install U1 (LM7805CT) and open SG4.
3. Battery Operation: Open SG4 and install U1 (LM7805CT) with its metal
tab facing to the left as shown in Figure 3. Allowable input power ranges
(J1, pins 5 and 6) are as follows:
3. Input Resistor Dividers: Always use 1%, or better, metal-film resistors
for R1 and R2, and also make sure their power and voltage ratings are
adequate for the given application.
DMS-20PC-X-XS +7.5 to +12.6Vdc
DMS-20PC-X-XL
+7.5 to +32Vdc
4. Using U1 (LM7805CT): The input power range specified in the Battery
Operation section is rated conservatively assuming a 100mA LED meter
or a 35mA backlit LCD meter. If a non-backlit LCD model or the low-
power LED model is used, the input voltage range can be extended up to
32Vdc.
C2 (10μF/35V) can be added to reduce noise. Observe correct polarity.
Refer to Technical Note 4 for more information.
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-EB2.E01 Page 2 of 4
DMS-EB2
Multi-Purpose Application Board
for DMS-20PC/LCD Meters
R1
12
SG10
1
R3
U1
TO-3-style tab
points to left
To measure input voltages
greater than 100ꢀVdc
open SG10 anV also dut
these two etdh paths.
SG1
Figure 4. Installing R1
4. Calibrate the meter using a known voltage source. Adjust the internal
gain potentiometer to compensate for variations in R1 and R2.
Figure 3. Installing U1
Example
IN is 199.9Vdc, and the display reading must be "199.9".
4. Calibration Adjustment: The DMS-EB2 has provisions for adjusting the
calibration of the DMS-20 meter. Calibration adjustment is useful when
an input divider (using R1 and R2) is necessary to scale the input voltage.
The calibration potentiometer allows "tweaking" of the display reading.
V
1. Assume R1 = 1.0M7ꢀ
2. R2 = (FSI x R1) / ( |VIN| - FSI)
R2 = (1.999 x 1,000,000) / (199.9 - 1.999)
R2 = 10101.01Ω or 10kΩ
Using the calibration potentiometer
Adjust the calibration pot on the back of the meter as desired. The
adjustment range is only 3/4 of a turn. Do not force the pot past its end
stops.
7. Current Measurements (Use 200mV Model, DMS-20PC/LCD-0): The
following instructions are for measuring current derived from the DMS-
20PC/LCD's power source. When measuring current that is floating with
respect to J1, pin 6 (GROUND), leave SG5 closed.
5. Differential Input Signals (Signal Referenced to Power Source): Open
SG5. Apply the input signal to pin 1, (+) IN HI, and pin 2, (–) IN LO, of J1.
NOTE: Common mode voltage must not exceed 2Vdc.
CAUTION: Do not exceed 1 Ampere input current.
6. Measuring Input Voltages Greater than 1.999Vdc (Use DMS-20PC/
1. Install R2 (R2 = FSR / (IMAX x 10000)) where FSR is the
desired reading (0-1999) and IMAX is between 0 -1 Ampere.
LCD-1 Only):
CAUTION: Do not exceed 250Vdc input signal.
2. Open SG5.
1. Open SG10. For applications in which input voltages exceed 100Vdc,
also cut the 2 adjoining traces.
3. Apply input signal (current) to (+)IN HI and (–) IN LO.
4. Adjust internal gain pot for desired full scale readings.
5. Enable decimal points using either SG1, SG2 or SG3.
Example
2. Calculate values for R1 and R2 as follows:
R2 = (FSI x R1) / ( |VIN| - FSI)
Where:
A 1.0 Ampere input must read "1.000" on the display.
FSI = The attenuated voltage, between the meter's (–) IN LO and (+) IN
HI pins, needed to achieve the desired display readings
R2 = 1000 / (1 x 10000)
R2 = 0.1 Ohm
V
IN = Input voltage at J1 (beween pins 1 and 2)
Enable DP1 via SG1 for reading of 1.000
A typical value for R1 is 1M7. The sum of R1 + R2 should be
between 50k7 and 10M7.
8. Displaying DMS-20PC/LCD's Power Source
(Use DMS-20PC/LCD-2, 5V-Powered Models Only):
3. Enable DP3 by soldering SG3.
1. If the power source is higher than 5Vdc, be sure to install U1 and cut
SG4. See Battery Operation section and Technical Note 4.
2. Solder a short piece of jumper wire across the two holes labeled J2.
3. Close SG2 to enable DP2.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-EB2.E01 Page 3 of 4
DMS-EB2
Multi-Purpose Application Board
for DMS-20PC/LCD Meters
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Canada:
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Murata Power Solutions, Inc.
France:
Germany:
Japan:
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
11/10/08
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-EB2.E01 Page 4 of 4
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